physiology test bank

1. Which of the following hormones secreted by diffusion across the plasma membrane? a. Peptide Hormones b. Steroid Hormones c. Acetylcholine d. Catecholamine’s Which of the following statements about peptide or protein hormones is usually true? a. They have Longer half-lives than Steroid Hormones b. They have receptors on the cell membrane c. They have a slower onset of action than both steroid and thyroid hormones d. They are not stored in endocrine-producing glands 3. Hypothalamic releasing hormones a. Are synthesized and secreted by neurons b. Are synthesized and secreted by endocrine cells c. Reach the general circulation in significant amounts d. Stored in posterior pituitary 4. The following molecules serve as a second messenger except one. Which one is not a second messenger? a. Ca++ b. cAMP c. ATP d. IP3 5. Which of the following causes constriction of vascular smooth muscle a. Antidiuretic Hormone b. Aldosterone c. Oxytocin d. Parathiroid hormone Which signal entering a pool causes a prolong output discharge lasting sometime after the incoming signal is over? a. Posttetanic Potentiation b. Afterdischarge c. Afterpotential d. Repetitive Firing Which of the following is the type of neuron whose axon forms synaptic junctions with skeletal muscle cells (intrafusal fibers) within the muscle spindles? a. Alpha motor neurons b. Pyramidal neurons c. Gamma motor neurons d. Purkinje cells In the patellar tendon reflex, which of the following synapses directly on alpha motor neurons that innervate the muscle being stretched? a. Ia sensory Fiber b. Ib sensory fiber c. Excitatory interneurons d. Inhibitory interneurons The fibers of the corticospinal tract cross to the contralateral side at: a. Thalamus b. Basal Ganglia c. Red Nucleus d. Pyramids Which of the following statements concerning the general the general functional role of the cerebellum is correct? The cerebellum a. Directly stimulates motor neurons required to make a movement b. Is unable to make corrective adjustments to a movement once it is performed c. Is not involved in the planning of a movement, only its execution d. Plays an active role in the coordination of the muscles required to make a movement